2.  Two rays with a common endpoint form an angle

3.  Two angles are supplementary if they add up to 180° - forming a straight line  Two angles are complimentary if they add up to 90°

4.  In terior angles are in side of the shape  Ex terior angles are formed when a line of a shape is ex tended

5. 1. Complimentary 2. Supplementary

6. 1. Two 2. Three 3. Four 4. Five

7. 1. 90° 2. 180° 3. 360°

8. 1. Right Angle An angle formed by perpendicular lines, line segments or rays with a measure of exactly 90° 2. Acute angle An angle that has a measure greater than 0° and less than 90° 3. Obtuse angle An angle whose measure is greater than 90° and less than 180°

9. 1. Right 2. Obtuse 3. Acute

10. 1. Right 2. Obtuse 3. Acute

11. 1. Right triangle A triangle with one right angle 2. Obtuse triangleA triangle that has one obtuse angle 3. Acute triangle A triangle in which all three angles are acute

12. 1. Right Triangle 2. Obtuse Triangle 3. Acute Triangle

13. 1. True 2. False

14. 1. Complimentary 2. Supplementary

15. 1. Scalene triangle A triangle with no congruent sides or angles 2. Isosceles triangle A triangle with two congruent sides and angles 3. Equilateral / Equiangular triangle A triangle with three congruent sides and angles

16. 1. Scalene 2. Isosceles 3. Equilateral

17. 1. Acute Isosceles 2. Obtuse Isosceles 3. Acute Scalene 4. Obtuse Scalene

18. 1. Right Scalene 2. Right Isosceles 3. Acute Isosceles 4. Obtuse Isosceles